relation between wps & wpq

**natt** · 09-19-2009, 05:15 PM

initially we qualified a welder for a certain wps(3G,Plate,groove,10mm thk)..later we did wpq for the above thickness...Now we need to qualify a welder(WPQ) in 2G,pipe,60.3mmod,5.54tk..Does v need a new wps?.. which clause of sec 9 address this point?

**viswanathankasi2** · 12-02-2009, 03:11 AM

i too needed it , ifany have the data pl. upload

**ify09** · 12-02-2009, 08:50 AM

as per QW 405.2 , up-hil progression in 3G, 5G, 6G qualifies WPS for all positions.

and your WPS range is now 4.76 mm to max. 20 mm because you did test on 10 mm thickness coupon.

now for WPQ, you did test coupon in 10 mm thickness so as per QW 451.1 , your WPQ is qualified for min. 1.5 mm to max.20

**ify09** · 12-02-2009, 08:51 AM

you do not need to qualify WPS

**ify09** · 12-02-2009, 08:57 AM

sorry, i put PQR data as WPQ,

as per QW 452.1 , if welder is tested any thickness 13 mm and over , he can weld maximum thickness.

in your case, if your welder is tested with 10 mm thickness, he is qualified to weld 20 mm(2T) thickness.

**curiousguy** · 12-02-2009, 07:06 PM

Welding positions are non essential variables. A PQR welded in any position is qualified for all positions. Position limitations apply only for welders, that is, the WPQ.